Graphics card recommendation?

I am looking for a new graphics card to help ramp up my rendering time. I current run an AMD Athlon 64 3000+ processor and am using an ATI Radeon 9800 SE. The card has served its purpose well, but now I have need for a better one. I only have AGP (8X) on my current motherboard and would like anyones recommendation on a replacement. I have a few in mind, but since I have this resource, I might as well ask.